/Engine/Source/Runtime/Core/Public/Misc/PreloadableFile.h
Helper function for InitializeAsync, sets up the asynchronous call to InitializeInternal
void InitializeInternalAsync ( [FCreateArchive](API\Runtime\Core\Misc\FPreloadableArchive\FCreateArchive) && InCreateArchiveFunction, [FCreateAsyncArchive](API\Runtime\Core\Misc\FPreloadableArchive\FCreateAsyncArchive) && InCreateAsyncArchiveFunction, uint32 InFlags, int64 PrimeSize )